Mathematics

http://calculusthemusical.com/ --- calculus songs
http://mathematics.hellam.net/
http://www.math.odu.edu/cbii/calcanim/#remedy
http://mathcast.sourceforge.net/home.html --- helps teachers to type mathe problems and dymbols
http://www.mathway.com/ ---shows solutions to problems step by step
http://www.purplemath.com/ --- great for algebra help and worksheets.